menu.h

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: t -*-


#ifndef __AP_COMMON_MENU_H
#define __AP_COMMON_MENU_H

#define MENU_COMMANDLINE_MAX    32      ///< maximum input line length
#define MENU_ARGS_MAX                   4       ///< maximum number of arguments
#define MENU_COMMAND_MAX                14      ///< maximum size of a command name

class Menu {
public:
        struct arg {
                const char      *str;                   
                long            i;                              
                float           f;                              
        };

        typedef int8_t                  (*func)(uint8_t argc, const struct arg *argv);

        typedef bool                    (*preprompt)(void);
        
        struct command {
                const char      command[MENU_COMMAND_MAX];

                int8_t                  (*func)(uint8_t argc, const struct arg *argv);  
        };

        Menu(const char *prompt, const struct command *commands, uint8_t entries, preprompt ppfunc = 0);

        void                            run(void);
        
private:
        void                            _help(void);                                    

        int8_t                          _call(uint8_t n, uint8_t argc);

        const char                      *_prompt;                                               
        const command           *_commands;                                             
        const uint8_t           _entries;                                               
        const preprompt         _ppfunc;                                                

        static char                     _inbuf[MENU_COMMANDLINE_MAX];   
        static arg                      _argv[MENU_ARGS_MAX + 1];               
};

#define MENU(name, prompt, commands)                                                    \
        static const char __menu_name__ ##name[] PROGMEM = prompt;      \
        static Menu name(__menu_name__ ##name, commands, sizeof(commands) / sizeof(commands[0]))
        
#define MENU2(name, prompt, commands, preprompt)                                \
        static const char __menu_name__ ##name[] PROGMEM = prompt;      \
        static Menu name(__menu_name__ ##name, commands, sizeof(commands) / sizeof(commands[0]), preprompt)

#endif